Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 6f7ff6d7 authored by Filipe Manana's avatar Filipe Manana Committed by Chris Mason
Browse files

Btrfs: read lock extent buffer while walking backrefs 



Before processing the extent buffer, acquire a read lock on it, so
that we're safe against concurrent updates on the extent buffer.

Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent e339a6b0

fs/btrfs/backref.c

+3 −0
Original line number Diff line number Diff line
@@ -1001,8 +1001,11 @@ again: 
					ret = -EIO;

					goto out;

				}

				btrfs_tree_read_lock(eb);

				btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);

				ret = find_extent_in_eb(eb, bytenr,

							*extent_item_pos, &eie);

				btrfs_tree_read_unlock_blocking(eb);

				free_extent_buffer(eb);

				if (ret < 0)

					goto out;